Terrace Water Corp Inc, ID
Lead detected, under the action levels
Latest 90th-percentile lead: 2 ppb (monitoring period 2023-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
Terrace Water Corp Inc at a glance
Terrace Water Corp Inc serves about 84 people through 28 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Ada County, Idaho. EPA system ID: ID4010036; phone on file: 208-888-0988. They can tell you what your service line is made of and whether they pay to replace it.
Terrace Water Corp Inc's lead record
That is up 2 ppb from 0 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Terrace Water Corp Inc is 2 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 2 ppb |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2016 | 0 (not detected) |
Where this result ranks
Of the 763 Idaho systems with a lead result, the median latest reading is 1 ppb; 3 are over 15 ppb right now and 46 have gone over at some point. Terrace Water Corp Inc's 2 ppb sits at the 63rd percentile in Idaho and the 70th nationally (higher means more lead).
Other water systems in Ada County
52 other systems share Ada County; 12 of them have a higher latest lead result than Terrace Water Corp Inc. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Veolia Water Idaho | 264,978 | 2 ppb |
| Meridian Water Dept | 152,070 | 3.9 ppb |
| Kuna City Of | 32,038 | 0 (not detected) |
| Star Sewer And Water Dist Water System | 14,000 | 1 ppb |
| Garden City Water And Sewer System | 12,500 | 1 ppb |
| Capitol Water Corp | 9,000 | 3 ppb |
| Eagle, City Of (Western Zone) | 6,108 | 1 ppb |
| Eagle, City Of (Eastern Zone) | 3,702 | 4 ppb |
| Idoc Sbx Complex | 3,309 | 0 (not detected) |
| Idoc Idaho State Correctional Center | 2,204 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Meridian, ID may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Terrace Water Corp Inc whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. The lead result guide covers how utilities pick the homes they sample. Size matters more than most people expect: small vs large water systems.